Carbureter.



A. C. BENNETT.

GAEBUBETBR.

urmcnrox rrnnn JULY 1, 1912.

Patented July 21, 1914.

ASHLEY C. BENNETT, F MINNEAPOLIS, MINNESOTA.

CARBURETER.

To all whom'z't may concern :v Be it known that I, ASHLEY C. BENNETT, acitizen of theUnited States, residing at Minneapolis, in the countyofHennepin and State ofl-Mmnesot'a, have invented certain l' new anduseful Improvements in Carbureters,l of which'the following is aspecification.

. invention relates to carbureters, and has for its object to provide aspecial type of'closure for the valve or inlet port for the air supply,such that the degree of opening of said inlet port will be automaticallyvaried to the speed ofthe engine and consequent-,rate of ow of airthrough the carbureter, -while at the same time the oil level in the oilchamber 'of the carbureter receptacle will be keptat a constant level. l

The full objects and 'advantages of my invention'will appear inconnection with the detailed description thereof and are particu larypointed outin the claims.

The Igure of the drawing, illustrating the application of my inventionin one forni,

consists primarily of a section through a -carbureter having myinvention applied thereto.

Asshown in the drawings, a. casing 1 incluses a chamber 2 for receivingthe gasolene or other fuel oil through an aperture 3 in a plug 4 screwedinto the casing 1 and in combination with the needle 5 compris- .inganeedle valve mechanism of well knownl construction, the plug 4 havingscrewed i The bottomof the casing thereon a cap 6 which forms a unionwith an elbow '7 having connection with a source of fuel supply, notshown. 2. may, if desired, be closed by a cap 8 lfor permittingi'eadyaccess` to and the assembling of parts vwithin chamber 2. Thecasing 1 is provided ling regulated with a. transverse partition 9 whichseparates theoil chamber 2 from `ari-air and mixing chamberl 10. Thechamber 10 is connected bye passage 11 to a. pipe 12 which, byconnections'not shown,

leads vto the cylinder the openingin Said pipe-beby a throttle valve 13of Anf air inlet pipe 14 of the engine,

usual construction.

opens through a port 15 into mixing'chamber 10, said port havingformedon the lower side thereof a valve seat 16 against which is l`adapted to seat the disk '17 of a check valve,

the stem' 18 of which passes through a guiding aperture 19 in partition9 into the oil chamber 2; l

specification of retterratent.

`Patented July 21, 1914.

Application led July 1, 1912. Serial No. 706,908.

The needle 5 has connected thereto by a ball and socket joint 2O an arm21 which is pivoted at 22, and anfa'rm 22E-integrally connected with arm21 extends'in the opposite direction from pivot 22 and has a yoke Q4 onthe end thereof embracing the stem 18. A lfloat 25 rides upon the`liquid in the chamber 2 which has afiXed level, as indicatedat 26. Thisfloat is providedwith an aperture 27 which loosely surrounds the 'stem18, the upper part of the iioat engaging the yoke :24 so that when thegasolene or other liquid fuel in the container rises to the level 26`the float will operate to 'close the needle valve, but as the level ofVsaid liquid is caused to fall byuse thereof the lvalve'will be openedso that fresh supplies are radmitted and the level within chamber 2 iskept practically constant. The stem 18 extends centrally through a float28 which may consist of cork 'or some other buoyant material, or be ahollow metal container, so long as its buoyancy will be of such degreeat all-'times as to maintain the disk 17 in engagement with the vvalveseat 16 with a predetermined pressure which' shall be just sufficient tokeep the port 15 closed to the extent required to regulate the influx ofair to the draft or speed of the engine. The iioat 2S may be cylindricalin cross section if chamter 2 is cylindrical, as is usually the case,inwhich eve-nt a sufficient passage-way E29 will be left so that asfloat Q8 rises and falls within chamberEZ there will be plenty of roomfor the-passage of liquid around the iioat from thelupper to' the lowerpartof the chamber` and yvice versa, with sulhcient rapidity to preventfluctuations vof the liquid surfaoef 26. To

steady the float QS a pin 30 may bei secured centrally to .t-heF-bdttomcap extending up within chamber-2 and centrally within stem 18positionedfinuloat 28, which'stem is preferably made 'hollowr for thatypurpose. 'ln'v case a hollow metal float is employed the stenravilltnotneed to extend through the body of the float but may be securedydirectly to the top, and the pin 30 will operyate in afchannel or wayformed inthe float.

lt isobvious that the same .result-s of steadying the float andpermitting vready movenient of liquid above and beneath the same may beeffected by causing t e float /to engage or come close y'to the wal s ofchamber 2 and arranging a by-pass from the liquid either directlythrough or along the margins of the ioat or through a separate passageoutside of chamber 2 in a Well known manner.

In some instances it is desirable to` have a second air inlet portentirely open which is suiciently large to admit enough air for' theslowest engine speeds, and such a port is. indicated at 31. The liquidfuel is fed into the mixing chamber through an pright tube 32 connectedby a passage 33 with chamber 2 and having aseries of apertures 34 in thewalls thereof through which the fuel is drawn by vacuum created by thedraft of air through the mixing chamber,

the tension of this vacuum increasing in proportion to the increase inspeed of the 4in tube 32 and port. If there is no second engine so thatthe liquid is drawn up farther resented to an increas ing number of saiapertures to be fed at a corres ondingly increased rate in proportion tosaid) degree of draft. The bottomtube 32 is surrounded by acup 35 havingthe bottom thereof slightly below the level 26 of the fuel in chamber 2so 'that a certain amount of liquid will normally be exposed `withinthis cup and excess of liquid drawn out through apertures 34 may passback through said apertures positioned within the cu into the passage33,' all of thesefeatures eing .shown and claimed in my Patent Number927,211, dated. July 6,1909.

`When used either with or without the extra air passage 31 it may sometimes balppen that it will be desirable to vary t e closin'fg pressureexerted upon valve disk 17. To e ect., this I may provide a socket 36from the bottom of which engagingwith disk 17, said .pinhaving thereona; collar 38 slidable within the socket 36, a sprin 39 surrounding thepin 37 and engaging t e collar 38 so as to press the pin outward with apressure which may be adjusted by means of a screw head, 40 the faceofwhich engages the upper end of -spring 39. By this means, when' it isde-4 sired to use the carbureter under somewhat radically differentconditions, the pressure of disk 17 rupon valve seat 16 maybe regulatedasdesired or even the disk 17 maybe held entirely out of engagement withlvalve seat 16 so asto leave a certain determined opening through theport 15. To prevent the suction ofthe air draft. in chamber 11 operatingto raise the level of liquid fuel in chamber 2 a small air port 41 isformed in the wall of 'casin' 1 at a point near the topof chamber 2 anabove the fuel level 26.

In operation, when the engine is running at slow speed, ifport 31 isemployed most or all of the air may be drawn through that port the airwill enter through port 15 pushing down the disk 17 and float 28. As thes eed of the engine increases so that the feedJ Ition und prevent suchfluctuation.

projects a pin 37 e of the air neces;`

sarily must be increased the rush of air.

ever,.be quick fluctuations of'the disk 17,

as is thecase ywhere the valve member isl spring-controlled,-1sincetheinertia -of the Aliquid which mustbe displaced and moved from the toptothe bottom of float 28, or vice versa, as said Iioat changes itsposition, will hold-the valve disk 17 in constant posi- It is noted thatthe ioat 28 is at all times submerged in the liquid of chamber 2. Itcannot, therefore, operate to Vchange the level of said liquid. Asherein shown, the float is submerged in the liquid 'which comprises thefuel of the engine. VIt is obvious7 yhowever, and falls within thescope' of my inven" tion, that the float 28 might be pbsition'ed in uchamber supported from the fuel chamber of the carbureter in which someother liquid than that which comprises the fuel might be employed.

I claim:

1. A carbureter comprisindr acasing having an air inlet port and ava vemember for closing the same, said valve member including a stem, areceptacle for the'liquidfucl formed in the casing and separated fromv-vthe air chamber of the carbureter into which receptacle said stemprojects, means for maintainlng the vliquid fuel 'at'a 'constant levelwithin the receptacle including a float sus- 'i tained upon the surface"of said liquid, said valve stem extendin centrallj'through said float, asecond float 'beneath the'rstnamed in the li uid to "wll'iichv iioat andsubmerged the valve stem is connectedV orpositi'oning' the valve member.I

2. A carburete'r comprising a casing'ha-w ing an air inlet port wlth avalveseatsurrounding' the same and a valve -membe'rengaging said valveseat for closing the port,

means for yieldingly holding the valve member in engagement with thevalve' seat, a sliding member engaging the Valveme'mber, a spring foractuating the ysliding member tofmove the valvemember against the forcei of its positioning means,VA and 'means to` 'a`d just the force exerted'bysaids'prings A c'arburete'rcomprising a casing having an air inletport witha valve seat 'surrounding the same anda valve member engagingsaid valve seat for closing the port, means for yieldingly holdingthevalve'member in engagement. with the v alve seat, said casing beingpro vided with a' socket extending over theport into proximity with theIvalve member, a pin slidable in said socket and engaging the valvemember, a spring in said socket tending to force the pin outwardly, andmeans to vary the tension-'of the springl-v ingnn.. air inletportenii'ounded by a Valve aviilveinelnber for engaging said seat t .theport, a receptacle partially filled 1131 liquid, a float- Submerged insaid liquid for connection with the' Valve mev lille ber for holding thesame in Contact Wit valve Seat at a predetermined pressure, and

yielding means engaging the valve memloel` and tending to movethewssgime out of engage- In testimony whereof I affix my signature inthe presence of two Witnesses.

ASHLEY C. BENNETT.

lVitnesses.

F. A. WHITELEY, H.- A.. BOURNAN.

